Health Care System Pays A Heavy Price For Adverse Drug Events

The most costly ED (emergency department) patients are those with adverse events due to misuse or use of medications, according to doctors and researchers at Vancouver General Hospital and UBC.

In an article published in Annals of Emergency Medicine, the authors write that their study is the first to look at the health outcomes and patient care costs for individuals coming into EDs with adverse drug events.

Dr. Corinne Hohl and team set out to determine what the health outcomes might be for those who presented to the ED with an adverse drug event. They were compared to patients who came in with other problems.

An adverse drug event is an unwanted and unintended medical event related to the use of medications.

After adjustment for baseline differences between patient groups, researchers found no difference in the mortality rate of the patients they studied, but those presenting with an adverse drug event had a 50% greater risk of spending additional days in hospital, as well as a 20 % higher rate of outpatient health care needs. The team followed 1,000 emergency department patients from Vancouver General Hospital for six months.

This new research builds on a 2008 study, published in the Canadian Medical Journal, which showed more than one in nine emergency department visits are due to medication-related problems.

"What we are finding is that these incidents are common and costly, both in terms of patient health and utilization of health care dollars," says Dr. Corinne Hohl. "We also know that these events are hard for physicians to recognize, and that nearly 70 percent of these incidents are preventable."

In BC alone, hospital emergency departments treat an estimated 210,000 patients each year for adverse drug events. The most common reasons for them are adverse drug reactions or side effects to medication, non adherence, and the wrong or suboptimal use of medication. The research team estimates that the cost of treating these patients is 90% greater than the cost of treating other patients after adjustment for differences in baseline characteristics. The added cost could be as much as $49 million annually.

The research team has been developing screening tools to better assist health care providers in the emergency department in recognizing patients at high risk for adverse drug events, as well as developing an evaluation platform that will help inform prescribing practices for physicians in the community

"We anticipate the development of a screening tool will be able to increase the recognition rate of these adverse drug events from 60 to over 90 percent, and we will be able to treat the patient effectively and rapidly, improving his or her care," says Dr. Hohl. "Right now we spend a lot of time trying to diagnose what is wrong with the patient, yet often miss the fact that there is a medication-related problem. This means that patients often go home still on a medication which may be causing harm." We are also using the data from this research project to help develop a new drug evaluation platform to inform prescribing practices for physicians in the community. The hope is to prevent many of these adverse events from even taking place."

Funding support for this research is through Vancouver Coastal Health Research Institute, the Michael Smith Foundation for Health Research, and the Department of Surgery at the University of British Columbia.